Dayle Haddon – the actor, activist and former Sports Illustrated model – has died from what authorities believe was carbon monoxide poisoning.

Authorities found the 76-year-old dead in a second-floor bedroom on Friday morning after emergency dispatchers were notified about a person unconscious at the house in Solebury Township, Pennsylvania.

A 76-year-old man, later identified as Walter J Blucas, of Erie, is in a critical condition.

Responders detected a high level of carbon…